Improvement in stove-grates



2 Sheets--Sheet l.. l. G. MACFARLANE.

Stove-Grates. Y No.155l62, A Patented Sept.22,`l874.

UNITED STATES PATENT OFFICE.

IsAIAH G. MACEARLANE, 0E PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN STOVE-GRATES.

Specification forming parli of Letters Patent N o. 155,162, dated September 22, 1874 applicatlon filed July 11, 1874.

To all whom it may concern:

Be it known that I, lsAIAH G. MAcEAR- LANE, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Grates; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing forming a part of this specilication, in which- Figure l is a perspective view of my improved grate. Fig. 2 is a top view. Fig. 3 is a vertical section on the line a: and Fig. 4 is an end view. v

Like letters of reference indicate like parts in each.

My invention relates to the construction of grates for use in stoves, furnaces, Snc.; and it consists in the combination of the horizontal fixed bars of a grate with horizontal movable bars having pillars, cross-bars, and guide-rods for preserving the parallelism of the movable bars and a suitable rock-shaft or operatingbar.

1n the drawing referred to, A is the grate having the stationary bars a and the movable bars b. The movable and stationary bars may alternate, as shown in the drawing; or may be in the proportion of two or more stationary bars to one movable bar, provided always that sufcient number of movable bars y are employed to give the required agitatingsurface. The movabler bars b are supported by a series of posts or pillars, b1, above the cross pieces or ties B, the pillars b1 being of sufficient length to allow the movable bars to be raised or lowered a suicient distance above the face of the stationary bars to permit any clinkers to fall beneath their level, and be caught between the stationary and movable bar, and crushed by` the downward movement of said bars. On the ends of the crossties B are the vertical rods b2 passing through slot or openings a in the grate A, and said rods may be provided with projections or lugs to prevent the grate from sinking at any time below the level of the stationary bars. These vertical rods may be a portion of the original casting forming thelnovable grate, consisting of the cross-ties B, pillars b1, and movable bars, or may be formed by the union of separate parts. G C1 represent the rocking shafts having their bearings in brackets D, pendent from the under `side of the grate A, said rock-shafts being provided with the arms c c1, the arms c being connected by cross-rod d, so that motion is communicated from one rock-shaft to the other. The arms c1 are connected with the vertical guide-rods b2 by the links o2, by which the oscillation of the shaft raises orv lowers the vertical movable bars through the intermediate mechanism. O2 is a lever attached to one of the rock-shafts for the purpose of oscillating the same, which, if desired, may be controlled by a rack or other device, so as to perform the same function as the lugs on the vertical rods i12-viz., prevent the movable bars from sinking below the level of the stationary bars.

Where the grate is applied to stoves of upright cylindrical form, the principle involved is not changed, but the construction is somewhat moditied, the rock-shaft being placed above the grate and attached to the top of the vertical rods, which pass toeach side of the cylindrical fire-pot, thus avoiding any incumbrance of the interior of the ash-box and contact with cinder. If desired, teeth or serrations may be made upon the under side of the movable bars to aid in crushing and removing clinkers.

The operation of these devices is as follows: By means of the lever C2 the rock-shaft C is oscillated, and communicates motion through the coupling-rod to the other rock-shaft, and thence through the links e2 and the crossties B to the movable bars b, causing the movable bars to rise and fall in a vertical line, agitating the superimposed mass. The amount of motion imparted to the bars will depend upon whether it is desired simply to displace the ashes or to break and remove clinkers. If the former, the movement is but slight; if the latter, the movable bars are raised to such a distance above the plane of the stationary bars as will allow any clinkers or similar matter to fall below the movable bars, so that the downward movement of the bars, aided by the weight thereof, will break and crush any clinkers that may be caught between them and the stationary bar, carrying the broken mass downward to the ash-pit beneath.

In using this grate care should be taken' not to leave the movable bars above the plane of the stationary bars', because of their liability to be destroyed when thus exposed to the re.

The advantages of grates constructed as described over those in which the movable bars have lateral movement are that in the former the Whole superimposed mass of coal is agitated, and the operation' is similar to that occurring Where a poker is used; in the latter only the lower part of the tire is at all disturbed.

Having thus described my invention, I claiin'-` e' y The combination of the horizontal fixed bars and horizontal movable bars b, having pillars b1, two or more cross-bars, B, and the rock-shaft C C, substantially as and for the purpose described.

In testimony whereof I, the said ISAIAH G. MACFARLANE, have hereunto set my hand. ISAIAH G. MAGFARLANE. Witnesses:

F. W. RITTER, Jr., T. B. KEER. 

